Supersnelle erbijsommen en erafsommen tot 20
In de mix
|
1.
19 + 0 =
3
19
4
2
|
2.
9 – 9 =
4
2
0
3
|
3.
12 + 5 =
4
3
2
17
|
4.
7 – 1 =
1
6
3
2
|
|
5.
1 + 13 =
14
3
2
1
|
6.
3 – 2 =
2
4
1
3
|
7.
7 – 4 =
2
4
3
1
|
8.
19 + 0 =
3
19
4
2
|
|
9.
13 – 1 =
3
2
12
1
|
10.
11 – 8 =
4
3
1
2
|
11.
20 – 17 =
3
1
4
2
|
12.
20 – 17 =
4
1
2
3
|
|
13.
1 – 0 =
3
4
1
2
|
14.
13 – 3 =
1
10
3
2
|
15.
14 – 7 =
3
7
1
2
|
16.
15 – 12 =
3
4
1
2
|
|
17.
12 – 10 =
4
3
1
2
|
18.
16 – 16 =
4
3
0
2
|
19.
13 – 13 =
4
2
0
3
|
20.
13 – 12 =
4
3
2
1
|